. >> nbc news correspondent pete williams has an update. what are you hearing regarding this video? >> video and still pictures is my understanding, tamron. >> yeah. >> we may see them today, we may not. this is kind of a back-and-forth thing. it seems, i guess, likely at this point that we will. and it should be clear if they do show these pictures today, these are the people they're most interested in talking to. you know, i don't think anyone at this point is saying the fbi has quote/unquote, found the bombers. they see the faces but they don't know who they are and if they show them publicly, they're going to be asking for public help to identify them so they can find them, talk to them and figure out what was going on there. it's always a difficult job to balance this, tamron, because on one hand the agented would prefer, i'm sure, to conduct this investigation on their own with a lot of tips that will turn out to be wrong but at the same time the longer they way, the more these people would get away or much worse try to do it again. there's competing pressures there. if they d